// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/macros.h"
#include "base/process/process_handle.h"

#include <stddef.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <unistd.h>

namespace base {

ProcessId GetParentProcessId(ProcessHandle process)
{
    struct kinfo_proc info;
    size_t length;
    int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, process,
        sizeof(struct kinfo_proc), 0 };

    if (sysctl(mib, arraysize(mib), NULL, &length, NULL, 0) < 0)
        return -1;

    mib[5] = (length / sizeof(struct kinfo_proc));

    if (sysctl(mib, arraysize(mib), &info, &length, NULL, 0) < 0)
        return -1;

    return info.p_ppid;
}

FilePath GetProcessExecutablePath(ProcessHandle process)
{
    struct kinfo_proc kp;
    size_t len;
    int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, process,
        sizeof(struct kinfo_proc), 0 };

    if (sysctl(mib, arraysize(mib), NULL, &len, NULL, 0) == -1)
        return FilePath();
    mib[5] = (len / sizeof(struct kinfo_proc));
    if (sysctl(mib, arraysize(mib), &kp, &len, NULL, 0) < 0)
        return FilePath();
    if ((kp.p_flag & P_SYSTEM) != 0)
        return FilePath();
    if (strcmp(kp.p_comm, "chrome") == 0)
        return FilePath(kp.p_comm);

    return FilePath();
}

} // namespace base
